12.12.8 Setting Limits on Bad RCPT TO Addresses

Keywords: deferralrejectlimit

Sets a limit on the number of bad RCPT TO: addresses
that are allowed during a single session. After the specified number of To: addresses have been rejected, all subsequent recipients, good
or bad, are rejected with a 4xx error. Provides same functionality
as the ALLOW_REJECTIONS_BEFORE_DEFERRAL SMTP channel
keyword, but on a per-channel basis.